Abstract
Nighttime respiration of the aboveground parts of a 12-year-old (as of 1986) hinoki (Chamaecyparis obtusa (Sieb. et Zucc.) Endl.) tree growing in the field was continuously measured over a three-year period, using an open gas exchange system which tracked ambient air temperature. The respiration rate in any month was described as an exponential function of air temperature. Daily respiration rate was lower in winter when the tree was dormant than in the summer. The daily respiration rate rose rapidly in spring to a maximum in June-July, decreased abruptly in autumn, and then decreased gradually to a minimum in January-February. The Qte for nighttime respiration was inversely related to air temperature. The highest Qla (2 3.0) was observed in January when the monthly mean nighttime air temperature was around 4.0 “C. The lowest Qla (~1.5) was observed in August when the monthly mean nighttime air temperature was about 23 “C. A Qla value of about 2.0 was observed in May and June when monthly mean nighttime air temperature ranged from 15 to 20 “C.
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